Part of the problem is no one is using the same time frames, or even definition of mass shooting. Until that is normalized and taken into account…Check this out: https://www.usconcealedcarry.com/resources/gun-facts-and-fiction/mass-shootings/
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The U.S. accounts for more than 30 percent of mass public shootings compared to other developed countries.
Out of 101 countries the US ranks 66th... Food for thought.